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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]      
Adjustment to pension liability, tax $ (0.3) $ 0.5 $ (0.5)
Derivative instruments accounted for as hedges, tax $ (2.4) $ (0.1) $ (2.2)